
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    class Fa {
      funcA(){
        console.log('funcA');
      }
    }
    class Fb {
      funcB(){

      }
    }

    const mixins = (target,from)=>{
      Object.getOwnPropertyNames(from).forEach(n=>{
        console.log(n);
        target[n] = from[n]
      })
    }
    mixins(Fa.prototype,Fb.prototype)
    const a = new Fa()
    console.log(a);
  </script>
</body>
</html>